Audemars Piguet Royal Oak Selfwinding Perpetual Calendar "Bleu Nuit, Nuage 50" | REF. 26674CD.OO.1225CD.01 41 mm | "Bleu Nuit, Nuage 50" Ceramic | Blue Dial | Ceramic Bezel | 2026 Released in early 2026, this reference brings AP's historic "Bleu Nuit, Nuage 50" blue, first created for the original 1972 Royal Oak dial, to a full ceramic case, bracelet and dial for the first time. It pairs this signature colour with Calibre 7138, AP's crown-adjustable perpetual calendar movement introduced in 2025. CASE Material: "Bleu Nuit, Nuage 50" ceramic, with a titanium caseback. Diameter: 41 mm. Thickness: 9.5 mm. Crystal: Glareproofed sapphire on the dial side, with a sapphire caseback. Water resistance: 50 metres (165 ft). BEZEL Octagonal "Bleu Nuit, Nuage 50" ceramic bezel, secured by hexagonal screws, the signature Royal Oak silhouette. DIAL Colour: Blue, Grande Tapisserie pattern, with a matching blue inner bezel. Hands: 18K white gold, filled with luminescent material. Markers: 18K white gold applied indexes, filled with luminescent material. Functions: Hours, minutes, week, day, date, month, leap year, astronomical moon phase. MOVEMENT Calibre: AP Calibre 7138. Type: Self-winding, perpetual calendar. Diameter: 29.6 mm. Thickness: 4.1 mm. Number of parts: 423. Jewels: 41. Frequency: 4 Hz (28,800 vph). Power reserve: 55 hours. Setting: All calendar corrections made via the crown alone, using a patented all-in-one adjustment system, eliminating the need for stylus-operated correctors. BRACELET & CLASP Material: Integrated "Bleu Nuit, Nuage 50" ceramic bracelet, matching the case. Clasp: Three-blade titanium folding clasp. YEAR INTRODUCED This reference was released in early 2026, applying the "Bleu Nuit, Nuage 50" ceramic first introduced across three models during AP's 150th anniversary in 2025 to the Royal Oak Perpetual Calendar for the first time.